Means for detaching obstructions from electric, telephone, and other cable conduits.



M. BLUMENTHAL. I MEANS FOR DETAOHING OBSTRUOTIONS FROM ELECTRIC, TELEPHONE, AND OTHER CABLE GONDUITS APPLICATION FILED SEPT.12,.1912.

1,080,251 Patented Dec; 2, 1913.

WIT/M8858 I Li gawk/ms UNITED STATES PATENT UFFTQEG 4 MAURICE .BLUMEN'IHAL, OF BROOKLYN, NEW YORK.

MEANS FOR DETACHING OBSTRUCTIONS FROM ELECTRIC, TELEPHONE, AND OTHER CABLE CONDUITS.

To all whom it may concern Be it known that I, MAURICE BLUMEN- THAL, a citizen of the United States, and residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Means for'Detaching Obstructions from Electric, Telephone, and other Cable Conduits, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to means for detaching obstructions from electric conduits used for various purposes, and particularly to What are known as jar rods which are usually composed of separate detachably connected sections and provided at one end with a blade or cutting member by means of which the obstructions are detached so that they will not interfere with the passage of electric wires or cables through the conduits; and this invention relates particu' larly to what I call a jar-link inserted into the jar rod, or forming a part there of, whereby a hammer action is produced and the operation of the'jar rod fac1l1- tate'd.

The invention is fully disclosed in the following specification of which the accompanying drawing forms a part, in which the separate parts of my invention are designated by suitable reference characters in each of the views, and in which Figure 1 is a side view showing part of an electric conduit in section and showing the method of operating my improved jar rod 5- Fig. 2 a, similar View of the jar rod on an enlarged scale, with part of the construction in section Fig. 3 a section on the line 3-3 of Fig. 2, and Fig. 4 a view similar to Fig. 3, but showing a modification.

In Fig. l of the accompanying drawing, I have shown at a an electric conduit composed of separate sections a two of which are shown in full lines and in longitudinal section while the others are indicated in dotted lines only. In practice it is customary to lay the conduit, or the separate sections thereof, in a bed of cement and to wrap the abutting ends a thereof with strips of fibrous material 6 previously dipped in cement or saturated with a preservative ma terial, and in this operation the cement or other material with which the strip 6 is Specification of Letters Patent.

Application filed September 12, 1912.

Patented Dec. 2,1913. Serial No. 719,930.

saturated and the concrete which covers the conduit flows in between the abutting ends of the separate sections of the conduit and hardens and forms inwardly directed projections or annular ribs 0 on the inner side of the conduit, and it is necessary to break off or detach these projections or ribs before the electric wires or cables can be passed through the conduit, and this operation is performed by what is known as a jar rod one of which is shown at (Z.

The jar rod (Z consists of separate detachably connected sections (Z said section being provided at one end with a threaded socket and at the other with a threaded stud adapted to be screwed into said socket, as shown at (Z and the said jar rod is provided at one end with an oblong blade or cutting device (Z which constitutes the obstruction detaching member and which is provided at its free end with an edge (Z The cutting member (Z is provided at the end thereof which is connected with the jar rod proper with a coupling 6, simi lar in form and transverse dimensions to the separate sections of the jar rod and provided at each end with a threaded stud 6 one of which isscrewed into a corresponding socket in the adjacent end of the cuttingmember (Z and with which my improvement, consisting of the jar-link f, is connected.

The jar-link f consists of a coupling member f connected with the coupling 6, as shown at f, and provided with a rod f and a sleeve f which is connected with the main part of a jar-rod, as shown at f. The rod f is provided with a piston head f movable in the sleeve f and the free end of said sleeve is closed by a threaded plug f through which the rod f passes and is freely movable and which forms a hammer head as hereinafter described. The connection of the j ar-link f with the coupling 6, at F, is made by means of a threaded socket in the part f into which the stud c of one part of the coupling 6 is screwed, and the connection of said jar-link with the main part of the. jar rod at f is made by means of a threaded socketformed in the adjacent end portion of the sleeve f and a threaded stud d on the adjacent section (Z of the jar rod, and by means of this construction all the parts of the jar rod including the jar-link F, the cutting member (Z and the coupling 6 may be connected and disconnected Whenever desired.

In Figs. 2 and 3, the rod f is shown cylindrical in form, but in Fig. cvsaid rod is shown as angular in cross section.

In laying the conduit a any desired num ber of the separate sections a may be abutted, and in practice, in order to detach the obstructions c, the jar rod is inserted into the conduit as the laying thereof progresses and is moved back and forth so as to cut ofl said obstruction or obstructions. In the use of the jar rod, as heretofore made,

' the above operation is diflicult, because of the length and weight of said jar rod, and especially of the cutting member CZ, but with my improvement it is necessary to move only the outer end portion of the jar rod including the sleeve f which slides on the rod f and the operation of the end of the sleeve adjacent to the coupling member f and in connection with said member, is that of a hammer, the longitudinal movement of the outer end portion of the jar rod and the sleeve f resulting in repeated blows of the hammer head of the sleeve formed by the plug f on the corresponding end of the coupling member f and in this way the obstruction or obstructions 0 in the conduit may be quickly and easily detached.

My invention is not limited to any particular method of constructing the jar rod including the cutting member (Z except as to the jar-link f inserted into said rod, as shown and described, said jarlink involving a coupling member f provided with the rod f and the sleeve f on which said rod operates, and the coupling member f may consist of one of the sections of the jar rod, if desired, and

changes in and modifications of the construction herein described may be made, within the scope of the appended claims, without departing from the spirit of my invention or sacrificing its advantages.

Having fully described my invention what I claim as new and desire to secure by Letters Patent is l. A jar-rod for detaching obstructions from the inner walls of conduits, said jarrod being composed of separate detachably connected parts one of which consists of a link member comprising a sleeve closed at one end and provided with a coupling head, said sleeve being closed at theopposite end by a detachable plug, a rod movable longitudinally through said sleeve and provided at its inner end with a piston head movable in said sleeve, and said rod being provided at its outer end with a detachable coupling head.

2. A detachable link member for rods composed of separate detachably connected parts, said link member comprising a sleeve closed at one end and provided with a coupling head, said sleeve being closedat the opposite end by a detachable plug, a rod movable longitudinally through said plug and through said sleeve and provided at its inner end with a piston head movable in said sleeve, and said rod being provided at its outer end with a detachable coupling head.

In testimony that I claim the foregoing as my invention I have signed my name in jar presence of the subscribing witnesses this* 7th day of September 1912.

MAURICE BLUMENTHAL.

\Vitnesses:

C. HULREANY, A. R. APPLEMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

